{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Disease", "Chemical"], "input": "The H2 - histamine receptor antagonists ranitidine and cimetidine were compared for their abilities to control gastric acid hypersecretion on a short - and long - term basis in 22 patients with gastric acid hypersecretory states ."}
{"Disease": [], "Chemical": ["histamine", "ranitidine", "cimetidine"]}